I have a hard time living with the leaks influenced greatly by my wife and desire for a pristine garage floor.

If you plan on keeping the car for 5+ more years, why not consider a rebuild for $1400? IF not, I'd opt to keep putting fluid in. As was mentioned in a prior post, all the rubber parts are the same age so internally, you have equal wear.

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Mark Herzig
1995 E300D 153K
1985 300D 142K (sold)
1979 450SL 122 miles (sold)
1992 500E 127K (sold)
1987 300SDL 132K (sold)
1986 300E 161K (sold)